Albus's starting weapon in the Castlevania DLC. Fires a twisting light and dark piercing projectile, evolves into Acerbatus with max-level Karoma's Mana, and keeps the base weapon active as a hidden slot after evolving.
Optical Shot stays in your loadout after it evolves.
Most evolutions replace the base weapon in its slot. Acerbatus is different. The wiki notes the evolution "keeps Optical Shot as hidden weapon," meaning the base form continues firing in the background while Acerbatus takes the visible weapon slot. So evolving Optical Shot effectively gives you two weapons in one slot for the rest of the run, which is a build advantage few other weapons offer.
The other unusual mechanic is on Albus himself. Per the wiki, Albus "gains a bonus to Might and Cooldown based on the proportion of on-screen enemies out of 300." At 300 enemies on screen, Albus has a maximum of -40% Cooldown and +40% Might. Most character bonuses scale from kills, levels, or Curse. Albus scales from raw enemy density, which makes him the only character in the entire DLC who actively wants to be surrounded.
The evolution gate is Karoma's Mana at max level. Karoma's Mana is a stage-item-only passive (it does not appear in level-up offers) found in Westwoods, Ode to Castlevania, and Emerald Diorama. Players new to Optical Shot often grind for the evolution on stages where Karoma's Mana doesn't spawn at all, which makes the run unwinnable for the unlock.
The unlock requires defeating 2,000 enemies with Albus. After a few runs the math becomes clear: a single normal Albus run hits the threshold by minute 12-15, especially since Albus's enemy-count scaling actively encourages you to kite waves rather than blast through them.
Optical Shot by defeating 2,000 enemies with Albus. Most Albus runs hit the threshold by minute 12-15
Acerbatus at max level paired with max-level 
Karoma's Mana. Acerbatus keeps Optical Shot active as a hidden weapon
Albus, who scales -40% Cooldown and +40% Might based on on-screen enemy count (max at 300 enemies)Optical Shot is classified as a Normal weapon in the Ode to Castlevania DLC with internal ID `TP_SPITE1`. The in-game caption reads "Fires two penetrating projectiles," but the wiki effects block contradicts that description directly: "Optical Shot fires a twisting light and dark piercing projectile (despite being described as 'two projectiles') and aims at faced direction." So the in-game text is wrong, and the actual mechanic is a single combined light-and-dark beam.
The Area stat affects the width of the piercing projectile, which is unusual. Most weapons treat Area as a hitbox-radius modifier. Optical Shot treats Area as a beam-width modifier, which means Candelabrador picks visibly thicken the beam rather than enlarging an explosion radius. The weapon also ignores Duration entirely per the wiki effects block.
The 4.0-second base Cooldown is on the high end for the DLC. After a few runs the practical pattern becomes clear: Optical Shot rewards Cooldown-stacking builds because each cast does so much damage that more frequent casts translate directly into more total damage. Albus's character bonus (which provides up to -40% Cooldown at 300 on-screen enemies) feeds this priority directly.
In our testing, Optical Shot positioning matters more than most projectile weapons. The horizontal-faced beam means the player needs to pivot toward the wave they want to clear. Combined with Albus's +40% Move Speed, the optimal pattern is to rotate the character to face the densest part of the screen, fire, then rotate again. Random walking patterns waste the beam by sending it toward empty space.
Optical Shot has 8 levels. The level-up structure mixes Damage, Amount, Area, and Speed picks across the scaling:
| Level | Bonus |
|---|---|
| Level 1 | Fires two penetrating projectiles. Base Damage 10, Cooldown 4.0s |
| Level 2 | Fires 1 more projectile (+1 Amount) |
| Level 3 | Base Area up by 25%. Base Speed up by 20% |
| Level 4 | Base Damage up by 10 |
| Level 5 | Base Damage up by 10 |
| Level 6 | Base Damage up by 10 |
| Level 7 | Base Area up by 25%. Base Speed up by 20% |
| Level 8 | Fires 1 more projectile (+1 Amount) |
At max level, Optical Shot gains +30 Base Damage, +50% Area, +40% Speed, and +2 Amount above level 1. The Damage scaling is the build's main DPS driver, while Area widens the beam (not just hitbox radius) and Amount adds parallel beams to the cast.
The Pierce stat is listed as "Area of Effect" rather than a numeric value, which is unusual in v1.13. Most piercing weapons specify a Pierce count (Pierce 3, Pierce 5, etc.). Optical Shot's beams pierce all enemies in their path without a count limit, making them effective wave-clearing tools on stages with dense enemy lines.
Albus is the build-defining character for Optical Shot. The wiki notes his unique mechanic: "Albus gains a bonus to Might and Cooldown based on the proportion of on-screen enemies out of 300. At 300 enemies, Albus has a maximum of -40% Cooldown and +40% Might."
| On-screen enemies | Might bonus | Cooldown bonus | Notes |
|---|---|---|---|
| 0 enemies | 0% | 0% | No bonus active |
| 75 enemies | +10% | -10% | Roughly minute 4-5 on standard stages |
| 150 enemies | +20% | -20% | Mid-game density, minute 8-10 |
| 225 enemies | +30% | -30% | Late-game density, minute 15+ |
| 300 enemies (cap) | +40% | -40% | Maximum bonus. Common during boss waves and high-Curse runs |
Most characters reward thinning out enemy density to stay alive. Albus rewards the opposite: keeping enemies alive on screen until the bonus reaches its peak, then unleashing a high-Might high-cast-rate burst. After a few attempts the pattern becomes practical: kite waves, let them gather, then turn and fire Optical Shot at maximum stat conversion.
Curse-stacking arcanas pair naturally with this mechanic. Wicked Season (XIII) and Disco of Gold (XV) both increase enemy density over time. Combined with Albus's +40% Move Speed (which lets him kite at scale), high-Curse builds reach the 300-enemy cap reliably by minute 15-20 in endless runs.
Don't pick Garlic on Albus. Garlic damages enemies that get close, which thins density specifically in the area where Albus is standing. That actively works against the enemy-count scaling. Stack Wings or other Move Speed passives instead so Albus can kite tightly without needing to kill the trailing waves.
Optical Shot evolves into Acerbatus when paired with max-level Karoma's Mana. The wiki specifies a critical detail about this evolution: "Evolving it keeps Optical Shot as hidden weapon." That's unusual. Most evolutions replace the base weapon in the slot. Optical Shot's evolution adds Acerbatus to the loadout while keeping Optical Shot firing in the background.
| Step | Requirement |
|---|---|
| 1. Equip Optical Shot | Auto-equipped on Albus, or pick from level-up offers if unlocked on other characters |
| 2. Level Optical Shot to 8 | Standard level-up path |
| 3. Find Karoma's Mana | Stage item only. Spawns in Westwoods, Ode to Castlevania, or Emerald Diorama. Cannot be obtained from level-up offers |
| 4. Max Karoma's Mana (level 5) | Reach the passive's max level. Provides +50 Charm and +50% Fever at max |
| 5. Open chest at min 10 or 20 | Standard evolution gate. Acerbatus appears alongside Optical Shot rather than replacing it |
| 6. Barlowe unlock | Triggers automatically when the evolution completes for the first time |
According to the wiki, after evolving Optical Shot into Acerbatus, the base Optical Shot remains in the loadout as a hidden weapon. It continues to fire its twisting light-and-dark beam at the same Cooldown and stats it had before the evolution, while Acerbatus runs as the visible weapon. In practice, this means the player gets two weapons firing from a single original slot, which doubles the build's damage output relative to standard single-evolution loadouts.
This mechanic is shared with a small handful of other DLC evolutions (Sole Solution, Alucard Shield) but is rare enough that most players don't expect it. After a few attempts the implication becomes clear: Optical Shot builds want to push hard for the Acerbatus evolution because the resulting two-weapon-in-one-slot setup compresses the build into fewer slots and frees up other weapon picks.
Karoma's Mana is a stage-item-only passive. Per the wiki, it cannot be obtained from level-up offers and must be found as a pickup on specific stages.
| Stage | Karoma's Mana | Notes |
|---|---|---|
| Ode to Castlevania | Yes | Best stage for Optical Shot evolution. Long stage, Albus's natural home stage |
| Westwoods | Yes | Standard alternative. Good enemy density for Albus's 300-enemy cap |
| Emerald Diorama | Yes | Available on the Emerald Diorama DLC stage. Fewer Castlevania DLC enemies, higher Glimmer mechanic involvement |
| Mad Forest | No | Karoma's Mana does not spawn here |
| Inlaid Library | No | Karoma's Mana does not spawn here |
Karoma's Mana has 5 levels and provides +10 Charm and +10% Fever per level (+50 Charm and +50% Fever at max). The wiki description notes the passive "increases enemies spawn quantity by 10. Increases duration of Gold Fever and Gold Finger by 10%." So the passive itself adds enemy density, which feeds Albus's 300-enemy scaling cap directly. The passive is functionally a build-defining pick on Albus runs even before the evolution gate role.
Pick Ode to Castlevania as the stage for Optical Shot evolution runs. Karoma's Mana spawns there reliably, the enemy density supports Albus's scaling, and the longer stage timeline gives more time to max-level both Optical Shot and Karoma's Mana before the minute 10 evolution chest opens. Westwoods is the secondary pick if Ode to Castlevania is unavailable.
Albus is the natural carrier for Optical Shot because it's his starting weapon and his enemy-count scaling mechanic feeds the build directly. The wiki lists his stats: 120 Max Health, +40% Move Speed. He gains up to -40% Cooldown and +40% Might at 300 on-screen enemies. He can also find special Ode to Castlevania pickups from light sources, which is a niche stage-progression bonus.
Albus+Optical Shot (starting weapon)Optical Shot+Max Karoma's Mana→Acerbatus (plus hidden Optical Shot)Karoma's Mana (evolution gate, plus enemy spawn quantity for the 300-enemy cap)
Empty Tome (stacks with Albus's enemy-count Cooldown reduction)
Candelabrador (Area widens the beam width specifically, not hitbox radius)
Spinach (Might multiplier on top of Albus's enemy-count Might bonus)
Wings (Move Speed for kiting tight circles around enemy clusters)
Duplicator (more Amount = more parallel beams from Optical Shot AND Acerbatus)Wings deserves a callout. Most projectile builds treat Wings as a niche Move Speed passive. On Albus specifically, Move Speed is mathematically tied to the build's damage scaling because faster movement enables tighter kiting circles, which keeps more enemies on screen, which raises the on-screen enemy count toward the 300 cap. Across multiple runs, Wings-enabled Albus builds reach the 300-enemy cap roughly 30-40% faster than non-Wings builds.
Garlic is intentionally excluded. Garlic damages nearby enemies, thinning density in exactly the zone where Albus is standing. That actively reduces the on-screen enemy count, which reduces Albus's Might and Cooldown bonuses. The trade is bad math: Garlic's modest damage output does not match the 40% Might and 40% Cooldown that gets sacrificed by lower enemy density.
Wicked Season (XIII) ramps Curse upward over time, which scales enemy density and HP. On Albus specifically, this is the keystone arcana because higher enemy density feeds the on-screen count toward the 300 cap. Combined with Karoma's Mana's "increases enemies spawn quantity by 10" effect, Wicked Season runs reach the 300-enemy cap reliably by minute 12-15.
Disco of Gold (XV) enhances gold pickups, which interacts with Karoma's Mana's Fever-extending effect. Karoma's Mana increases the duration of Gold Fever and Gold Finger by 10% per level. Disco of Gold pushes the gold-pickup density higher, which translates into more frequent Gold Fever activations, which Karoma's Mana then extends. After a few runs the loop becomes obvious: Disco of Gold plus Karoma's Mana plus Albus's Charm bonuses produce a self-sustaining gold farm during endless runs.
Run Optical Shot alongside other Castlevania DLC magic weapons that share the Albus build framework. Whip-family weapons (with their fixed cast pattern) leave Albus free to kite tight circles around enemy clusters while Optical Shot handles the forward-cone clearing. Within the broader Castlevania weapon set, Optical Shot pairs naturally with weapons that have AoE damage to thin density only on demand, leaving the bulk of the screen populated for Albus's scaling. Avoid pairing with directional cone-only weapons that compete for facing direction; Optical Shot already demands the forward arc.
Optical Shot is a deep Castlevania: Order of Ecclesia (2008) reference. In Order of Ecclesia, Albus is one of the central antagonists, a member of the Order who uses Glyph magic to fight the protagonist Shanoa. His signature attack is "Acerbatus," a dark light-and-shadow Glyph that fires a piercing beam combining light and dark elements. Vampire Survivors imports the entire kit directly: Albus is playable, his starting weapon Optical Shot fires the same light-and-dark piercing beam, and the evolution form is named Acerbatus.
The wiki even preserves the "Order of Ecclesia" naming pattern for the surrounding kit. Karoma's Mana is a reference to the Glyph union mechanic from Order of Ecclesia, where two Glyphs combine into a more powerful effect. Barlowe, the character unlocked by evolving Optical Shot, is Albus's mentor and the leader of the Order of Ecclesia in the source game. Per the wiki, Barlowe starts with Dominus Anger (another Order of Ecclesia Glyph reference) rather than Optical Shot, since in the source game Barlowe wields the Dominus Glyphs as his signature weapons.
Albus and Barlowe were both added in the Ode to Castlevania DLC release on 31 October 2024 (Halloween). The Ebony Diabologue passive that Barlowe receives as a guaranteed level-up option until level 11 is another Order of Ecclesia callback: in the source game, Barlowe's combat style relies on linked Glyph attacks, and Ebony Diabologue mechanically replicates that linked-attack pattern as a free passive offering. Albus's character ID `TP_ALBUS` and Optical Shot's ID `TP_SPITE1` use "TP" as the Castlevania DLC namespace prefix, with "SPITE" referencing the dark, vengeful nature of Albus's Glyph kit in Order of Ecclesia lore.
The wiki specifies the unlock condition as defeating 2,000 enemies with Albus. The kill counter is per-run rather than cumulative across saves, so a single Albus run on a dense stage like Ode to Castlevania or Westwoods can reach the threshold by minute 12-15. Albus himself is unlocked by fully evolving Confodere in the Castlevania DLC.
Evolve Optical Shot at max level (level 8) when paired with max-level Karoma's Mana (level 5). Karoma's Mana is a stage-item-only passive, so it must be found on Westwoods, Ode to Castlevania, or Emerald Diorama. It does not appear in level-up offers. Open any chest at minute 10 or later with both at max level to receive Acerbatus.
No. The wiki specifies that evolving Optical Shot 'keeps Optical Shot as hidden weapon.' After the evolution, Acerbatus appears in the visible weapon slot while Optical Shot continues firing in the background. This is unusual; most evolutions replace the base weapon in its slot. The mechanic effectively gives the build two weapons in one slot, which is shared with a small number of other DLC evolutions like Sole Solution and Alucard Shield.
Per the wiki, Albus 'gains a bonus to Might and Cooldown depending on how many enemies are in sight.' The scaling caps at 300 on-screen enemies, where Albus has -40% Cooldown and +40% Might. The bonus scales linearly: 75 enemies grants +10% Might / -10% Cooldown, 150 grants +20% / -20%, and so on. This makes Albus the only Castlevania DLC character who actively wants to be surrounded by enemies rather than thinning them out.
Evolving Optical Shot for the first time unlocks Barlowe as a playable character. The wiki confirms 'Evolving it will also unlock Barlowe.' Barlowe can then be purchased for 2,000 gold and starts with Dominus Anger (not Optical Shot). Barlowe also has a unique passive: until level 11, he receives Ebony Diabologue as a guaranteed 4th level-up option.
Karoma's Mana spawns as a stage item on three stages per the wiki: Westwoods, Ode to Castlevania, and Emerald Diorama. It cannot be obtained from level-up offers. Mad Forest, Inlaid Library, Bat Country, and most other stages do not produce the passive at all. For Optical Shot evolution runs, Ode to Castlevania is the priority stage because it combines Karoma's Mana access with Albus's enemy-density scaling.
Damage, Amount, Cooldown, Area, Speed, and Might. The wiki effects block specifies Optical Shot 'ignores Duration,' so Spellbinder produces zero benefit on this weapon. One detail worth flagging: Area affects the WIDTH of the piercing beam rather than a hitbox radius, which means Candelabrador picks visibly thicken the beam. Pierce is listed as 'Area of Effect' rather than a numeric count, so the beam pierces all enemies in its path without limit.
Acerbatus is the evolved form of Optical Shot, requiring max-level Karoma's Mana. It's an Ode to Castlevania DLC weapon with internal ID `TP_SPITE2`. The name comes from Castlevania: Order of Ecclesia (2008), where Acerbatus is a powerful dark Glyph that combines light and shadow magic. In Vampire Survivors, Acerbatus retains the light-and-dark piercing beam mechanic from Optical Shot but at substantially higher base damage and projectile count.
For other Castlevania DLC weapon spokes, see our Raging Fire guide, our Ice Fang guide, our Gale Force guide, our Rock Riot guide, our Alchemy Whip guide, our Shuriken guide, our Tyrfing guide, our Vampire Killer guide, our Coat of Arms guide, and our Alucart Sworb guide. For Operation Guns DLC weapons, see our Long Gun guide, our Short Gun guide, our Spread Shot guide, our Metal Claw guide, and our Prism Lass guide. For Tides of the Foscari and Emerald Diorama DLC weapons, see our Shadow Servant guide and our Splashers guide. For thrown-projectile and grenade comparisons, see our Javelin guide, our Hand Grenade guide, and our Arma Dio guide. For base game evolution comparisons, see our Glass Fandango guide, our Pentagram guide, our Bracelet guide, our Crimson Shroud guide, our Infinite Corridor guide, our Victory Sword guide, our Pako Battiliar guide, and our Gaze of Gaea guide. The weapon tier list ranks every weapon in v1.13 and the weapon evolution chart covers every recipe including Acerbatus. The passive items guide walks through Empty Tome, Candelabrador, Spinach, Wings, and Duplicator. The main Vampire Survivors guide is the hub for everything else.
Image sprites and screenshots sourced from the Vampire Survivors Wiki (vampire.survivors.wiki) under CC BY-NC-SA 3.0.